往复压缩机连杆小头轴瓦磨损建模仿真与监测诊断方法研究

Research on Dynamics Simulation and Diagnosis Method of Connecting Rod Small End Wear Fault of Reciprocating Compressor

往复压缩机连杆的运动状态和受力状态复杂,属于故障多发的关键传动部件。在往复压缩机故障诊断领域,连杆小头轴瓦磨损故障存在故障机理不清晰、故障特征不显著、故障监测数据缺乏等问题,是困扰设备管理和故障诊断人员的难点。针对上述问题,本文通过动力学仿真,研究曲柄-连杆机构动力学响应,通过设置连杆小头轴瓦与十字头销之间的间隙,模拟连杆小头轴瓦磨损故障,分析小头轴瓦不同程度磨损的动力学行为,提出了一种基于振动信号瞬时Teager能量角域特征的连杆小头轴瓦磨损故障诊断方法 ,利用实验台故障模拟实验数据测实验证了方法的有效性。

The connecting rod of the reciprocating compressor, as one of the key moving parts, emerges faults frequently, because of its extremely complicated motion states and stress states. Especially the wear fault of the small end is always a bottleneck problem in the field of fault monitoring and diagnosing, results from the fault mechanism is not clear, the features of the wear fault are unapparent and the real-time monitoring data is deficient. This paper aims to present a new method to diagnose the above wear fault. At first, a contact model of a clearance in the revolute joint of the small end of a connecting rod bearing is established and a multi-body simulation tool is utilized to simulate the slider-crank mechanism with a clearance. Based on the simulation results and Teager energy of vibration signal, a method of diagnosing connecting rod bearing wear fault is presented. The availability is verified by conducting an experiment on a reciprocating compressor. Moreover, the experimental results show that this method not only accurately diagnoses the wear fault of SECRB, but also approximately estimates its severity.